Mechanical movement



(No Model.)

J. A. PENNELL MECHANICAL MOVEMENT. No. 455,248. Patented June 30,1891.

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JOHN A. FlENNELL, OF BRADENVILLE; PENNSYLVANIA.

MCHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 455,248, dated J' une30, 1891. Application filed January 28, 1891. Serial No. 379,407. (Nomodel.)4

To all whom t may concern: Be it known that l, JOHN A. FENNELL, acitizen of the United States, residing at Bradenville, in the count-y ofVestmoreland and State of Pennsylvania, have invented a new and usefulMechanical Movement, of which the following is a specification".-v

This invention relates to machine elements, and more especially to theracks and pinions included therein.

The object of the invention is to provide an improved movement adaptedmore especially for application to the plungers of presses or to othersimilar positions in machinery wh ere it is desired that the powerimparted by a piston driven by a fluid shall be positively communicatedto the plunger-head in such manner as to cause the latter to move, firstswiftly, and finally, when the greatest resistance occurs, at the samespeed as said piston.

To this end the invention consists of the mechanical movementhereinafter described and claimed, the same embracing a toggleleverdriven by a rack and pinion, all of the more particular arrangement setforth below, and illustrated on the sheet of drawings, wherein- Figure lis a front elevation, Fig. 2 a side elevation, and Fig 3 a centralvertical longitudinal section, of this device with the plunger-headraised. Fig. et is a similar section showing the device in full lines atthe moment the positive stroke commences and in dotted lines at t-hemoment of its completion.

Referring to the said drawings, the letter C designates a suitablecasing, Within whose lower end reciprocates in the present instance aplunger-head P, and at whose upper end is located in the presentinstance a cylinder Y, within which moves a piston-head of the ordinaryconstruction, as will be clearly understood. Extending from thispiston-head downwardly into the casingis a piston-rod R, having a fork Fat its lower end, and pivoted within this fork is a U-shaped link U, thepivot-pin 1, connecting these members, extending transversely and movingwithin slots 10 in the sides of the casing C.

The letter L designates a connecting' link or pitman pivoted at itslower end between ears E on the plunger and at its upper end between thefeet of said U-shaped link U,

by any suitable power, the rod R and fork F- are correspondingly moved,the pin 'l moving' in the slots l0. The teeth T move over those in therack-bar K, and the link U is thereby given a positive movement aroundits pivot l, the pivot-pin 2 in the outer end of saidv link movingthrough the curved slots 20, as will be obvious'. As soon as this pinhas moved through the length of the curved portions 20 of. these slotsto the position shown in full lines in Fig. 4f it will be obvious thatthe rod R, link U, and pitman L stand in direct alignment, and furthermovement of the rod by the piston will be imparted directly and forciblyto the plunger. Hence it will be seen that throughout the first portionof the downward movement of the piston such movement is converted by theengagement of the teeth T with the rack K into a rapid movement of theplunger; but as soon as the parts get into alignment, at which time saidteeth and rack-bar disengage, the conversion of the motion ceases and itis directly communicated to the plunger. Thereturn or upward movementsof the parts will of course correspond.

By the use of a device of this character a short but powerfulmovement'of the rod R' may be utilized to drive the plunger P, firstswit'ty through a corisiderable.flistance, and then slowly and verypowerfully through the balance of its stroke. If, therefore, the pistonbemoved by hydraulic or pneumatic pressure and the plungerbe theplunger-head of a hay7 or other press,it will be obvious that a shortmovement of the piston will effect exactly the operation of theplunger-head which is desirable. I do not, however, limit myself to theuse of this device in connection with a press, although I have thusdescribed its application, as it is obviously applicable to hoist- IOOVesame ing devices as well as to various other points where a machineclement of this character will be useful; and even by a slight change instructure, as the omission of the straight portions 2l of the slots 20,the device could be used in a pile-driver or in other locations where ahammer action was desiiable.

The advantage of this device is that it converts a slow but powerfulmovement into aswift one, but terminating in a short stroke of the sainespeed as said powerful movement, and all this is done in a positivemanner, not depending upon the movements of pivoted arms, as in anordinary toggle-lever.

What is claimed as new isl. The herein-described mechanical movement,the same comprising a casing having a rack-bar secured therein andhaving longitudinal slots in its sides, a piston-rod having a forkedlower end, a link pivoted in said fork and having teeth on its headengaging said rack-bar, the ends of the pivot-pin moving in said slots,a pitman pivotally connected to said link at its other end, and aplunger connected with the pitman, as set forth.

2. The herein-described mechanical movement, the same comprising acasing having a rack-bar therein and having in its sides straightlongitudinal slots and curved slots, a piston-rod having a forked lowerend, a U- shaped link pivoted in said fork and having teeth on its headengaging said rack-bar, the ends of the pivot-pin moving in saidstraight slots, a pitman pivoted between the feet of said link, the endsof this pivot-pin moving in said curved slots, and a plunger pivotallyconnected with the other end of the pitman, as set forth.

3. The herein-described mechanical movement, the same comprising acasing having a rack-bar therein and having in its sides straightlongitudinal slots extending slightlT below the lower end of saidrack-bar and curved slots extendin over said straight slots and havingstraight extensions at their lower ends in alignment with the straightslots, a piston-rod havinga forked lower end, a U-shaped link, itsheadpivoted in said fork and having teeth thereon engaging the rackbar, theends of the pivot-pin moving in said straight slots, a pitman, one ofwhose ends is pivoted between the feet of said link, the ends of thispivot-pin moving in said curved slots and their extensions, and aplunger pivotally connected with the other end of the pitman, as setfort-h.

4-. The herein-described mechanical movement, the same comprisingacasing having a rack-bar therein and having in its sides curved slots, apiston-rod .having a forked lower end, a U-shaped link, its head pivotedin said fork and having teeth engaging the rack-bar, a pitman, one otwhose ends is pivoted between the feet of said link, the ends of thepivot-pin moving in said curved slot-s and their extensions, andaplnnger pivotally connected with the other end of the pitmau, as setforth.

5. The herein-described mechanical movement, the same comprising acasing having a rack-har therein and provided with curved slots in itssides having straight extensions at their lower ends, a `piston-rodhaving a forked lower end, a U-shaped link with its head pivoted in saidfork and having teeth engaging the rack-bar, a pitman, one of whose endsis pivoted between the feet ot said link, the ends of the pivot-pinmoving in said curved slots and their extensions, and a plungerpivotally connected with the other en d ot' the pitman, as hereinbet'oreset forth.

In testimony that I claim the foregoing as my own I have hereto aiiixedmy signature in presence of two witnesses.

JOHN A. FENNELL.

fitnessesz GEO. DE LANEY, M. E. FENNELL.

